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there are a few kinds of BH that help cars start from extreme cold weather,
0 `$ v% Q* w! { X- m$ D" w* k4 b: Jbasically , BH keep the car warm by heating up the oil pan-which keeps the engine oil from frozen, or by heating up the coolant, and keep the engine block warm., z+ p4 V/ _0 B2 T3 H4 Y; J/ \
Either way, the engine shall not be frozen with use of BH.( S* r7 i; o- P" v6 Y% N. p
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If you do not have BH on ur car, by using synthetic oil you can also prevent oil frozen from happening.
+ {' Q1 B7 `8 r; o% \$ |A good synthetic oil, 5w20 or 5w 30 , or 3w 20 has a pure point of -30 to -40 degrees. |
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